Download Licensed software
If you have already purchased Vensim, you can download from here. Enter the registration code you were sent by email or that appears the back of your CD dust jacket. You will be offered the most current software you qualify for. You will be told if you need to upgrade or extend your maintenance to receive the newest version. If you have previously updated be sure to enter the most recent registration code you have.

Upgrades
If you want to upgrade to the latest Vensim release, and you bought Vensim directly from us, you can do so from here. Please log into the download center, links will be available for you to extend maintenance and upgrade.